public class main
{
    public static void main(String[] args) {
        String str1 = "  aa  ";
        String str2 = "  bb  ";
        System.out.println(str1 + str2);
        System.out.println(str1.trim() + str2.trim());
        int[] a = {1,2,3};
        for(int i = 0;i < a.length;i++){
            System.out.println(a[i]);
        }
    }
}
